Oil burner



Oct. A29, 1929. B. F. TRUESDELL OIL BURNER Filed Sept. 26, 1927 2 Sheets-Sheet l "Imm will alumni". dmhh wl @n A Oct. 29, 1929. B. F.. TRUESDELL A OIL BURNER Filed Sept. 26, 1927 2 Sheets-Sheet 2 .M wm. QN

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lmh A Patented Oct. 29, 1929 UNETED STATES PATENT OFFICE OIL BURNER Application filed September 26, 1927.

rThis invention relates to an oil burner tor use in the heating ot dwellings, stores and similar buildings, and which is installed in an ordinary coal furnace or heater, generally by placing the apparatus in the ashpit ot the furnace.

My object is to devise apparatus ot this type by means ot which improved combustion and therefore greater heating eifect is lo obtained tor the amount of oil consumed.

I attain my object by providing improved means tor preheating the air supplied to the nozzle and by providing means for obtaining a more thorough breaking up of the oil and admixture of air therewith at the nozzle.

rlhe improved apparatus is constructed substantially as hereinafter more specihcally described and illustrated in the accompanying drawings in which Fig. 1 is a plan view ot my improved apparatus;

Fig. :9. a. side elevation ot the same;

Fig, 3 a vertical section through the burner mechanism g Fig. L1 a vertical section on the line l--4'- in F ig. 1;

F ig. 5 a detail illustrating the hollow motor shaft with the nozzle attached thereto,

And Fig. 6 is a. section through the nozzle.

ln the drawings like numerals of reference indicate corresponding parts in the diierent figures.

My apparatus comprises a hollow'body l, trl-shaped in plan. A partition 2 is formed within the hollow body in substantial alinement with the inner wall of one leg, thereby dividing the interior ot the body into two passages body has an opening 3 in its upper surface, said openings being connected by means of a. hollow member 4, on the side of which is located a iiame spreader 5. The passage 6 opens at c7 through the out-er wall ot the body at the bot-tom ot the U and the passage 7 opens at 28a (see Figs. 3 and el) through the inner wall ot the body at the bottom ot the U.

Supported on the hollow body is the nozzle 8, which is hollow and has an opening 28 in its rear side near the bottom communicating with the opening 28a to the passage 7 in CII 6 and 7. The end of each leg of the Serial No. 222,918.

the body, and also an opening 29 in its rear side near the top communicating with a` hollow member 9 supported on the body. The forward wall 30 of the nozzle is preferably concaved or cup shaped as shown. The hollow member is termed ot two parts bolted togcther, the upper part 9 having a hole 29 in its side in alinement with the upper hole Q9 in the rear ot the nozzle 8 and the lower part a discharge outlet 31 in alinement with an opening 32 i'ormed centrally ot the nozzle.

Air entering the open end ot' the passage 6, it will be seen, passes along said passage, through the hollow member 4, then through the passage 7, into the hollow nozzle 8, through the parts ot the hollow member 9, and is discharged through the central hole in the nozzle.

F or supplying air to the passage 6, a tan 10 is provided located in a housing 11. rThe housing is spaced from the hollow body 1 by means of an air intale casing 12, preferably formed ot a number of sections 33, 3%, 35 bolted together and provided with air inlet openings 13 in its top and sides and an outlet 36 arranged axially ot the 4tan 10.

The fan is mounted on the shatt 111 ot the electric motor 15. For a purpose which will shortlyappear the motor shaft is hollow and is ot a length suiiicient to extend beyond the tan 10, and has a tubular sprayer 16 mounted thereon. The sprayer gradually increases its diamei er towards its outer end, and is preferably removable so that sprayers oi larger or smaller internal dia-meter may be substituted. In the drawing the sprayer' is shown as threaded on the end ot the shaft. The sprayer is Iireferably provided with tins 37 on its outer surface adjacent its discharge end.

17 is an oil supply pipe, which will in practice be connected with a suitable oil supply tank, and leads to an oil dropper 18, which dropper is connected with a pipe 19 leading through the hollow sha-tt 14 and discharging into the sprayer 16. The oil dropper is preferably provided with a glass portion 38 so that it may be seen whether or not the oil is being properly fed.

A needle valve 20 is provided to regulate the flow of oil to the dropper and a pivoted gate 21 is provided for controlling the flow of air through the outlet of the fan housing. F or simultaneously actuating the needle valve and the gate, the stem 22 of the needle Valve is extended and is provided with a Vwheel 23 thereon by means of which it may be rotated. 0n the stem is secured the cra-nk arm 24: which is connected by means of a link 25 with an arm 26 connected with the gate 21. It will thus be seen that by rotating the wheel 23, both the gate and valve may be simultaneously opened or simultaneously closed.

The operation of the apparatus is as follows. Oil is fed to the supply pipe 17 and at the same time the motor 15 is set in operation to operate the fan 10 and rotate the sprayer 16. As the oil enters the sprayer 16, owing to the larger diameter of the latter and its rapid rotation, the oil is spread out into a very thin sheet and broken up as it travels outwardly in the sprayer for discharge into the nozzle 8. At the same time air forced through the passages 6, t, 7, 28, 29 and 32 by the fan 10 is discharged through the centre 4of the nozzle and mixes with the oil, and it is found that the provision of the fins 37 on the end of the sprayer 16 ayoids to a large extent the danger of a. greater quantity of air being supplied at one side of the sprayer than the other.

.Preferably the nozzle will have a concavoconvex reinforcing plate 39 therein, and I may also form independent passages 27 through the nozzle so that a certain amount of fresh air'may be mixed with the preheated air in the nozzle. This fresh air is taken from the air chamber 12, and passes through a pipe 40 into the space 11 in the member 9, thence into the annular cavity 42 inthe nozzle 8.

I show the nozzle and the hollow member 9 as formed of three separate parts, but .it will be evident, of course, that theymay be made as an integral casting if desired.

From the construction described it will be seen that the air for mixture with the oil is preheated to a high temperature during its passage through the apparatus prior to discharge'into the firepot. It will also be seen that by interposing the air inlet casing between thecombustion chamber of the fur-` nace and thefan and motor, overheating of the latter is avoided. The providing of the motor with the hollow shaft through which the oil is fed provides a. Very convenient method of breaking up the oil for mixture with the air at the point of combustion.

I/Vhat I claim as my invention is l. In an oil burner, the combination of a body having an air preheating passao'e therethrough; a nozzle having an air supphly opening therethrough communicating with one end of said passage; a motor having a hollow shaft forming an oil supply nozzle adapted to discharge through said opening; a fan on said hollow motor shaft; a housing encasing said fan and having a discharge opening communicating with the air preheating passage; and an air intake casing communicating with the fan housing and interposed between the fan housing and the body.

2. In an oil burner, the combination of a body having an air preheating passage therethrough; a nozzle having an air supply opening therethrough communicating with one end of said passage; a motor having a hollow shaft forming an oil supply nozzlek adapted to discharge through said opening; a fan on said hollow motor shaft; a housing encasing said fan and having a discharge opening communicating with the air preheating passago; and an air intake casing communicating with the fan housing and interposed between the 'fan housing and the body, an air preheating portion of said body extending in front of the nozzle and forming a spreader against which the flame from the nozzle may impinge.

Signed at August, 1927 BENJAMIN FRANKLIN TRUESDELL.

Collingwood, this 22d day of 

